Structural Characterization of Mn2+—ß″—Al2O3(Mn0.77Al10.46Mg0.54O17)

The structure of completely exchanged Mn²⁺—ß″—Al₂O₃(Mn_0.77Al_10.46Mg_0.54O₁₇) crystals has been investigated by single—crystal X—ray diffraction methods at room temperature (trigonal, R3¯, Z = 3, a = 560.65(7), c = 3329.3(9) pm). The manganese ions (Mn²⁺) are found to occupy Beevers‐Ross (56 %) and mid—oxygen positions (44 %) in nearly the same amounts. The crystal composition was confirmed by electron probe microanalyses on various crystals.